/Engine/Source/Runtime/Core/Public/Math/Vector.h
See if two normal vectors are coincident (nearly parallel and point in the same direction).
true if vectors are coincident (nearly parallel and point in the same direction), false otherwise.
static bool Coincident ( const [TVector](API\Runtime\Core\Math\TVector)< T > & Normal1, const [TVector](API\Runtime\Core\Math\TVector)< T > & Normal2, T ParallelCosineThreshold )